单选题After several ______ attempts to send the missile into space, the spacecraft was finally launched successfully.

单选题If Dorothy had not been badly hurt in a car accident, ______ in last month's marathon race.

单选题It is an interesting ______ that Robson can say that he would not use gamesmanship, but felt that the professional foul was not only a legitimate weapon in a given situation but also his responsibility.

单选题The combination of ______ and emotional interactions with infants is crucial to their learning and emotional development.

单选题Is Mary ______ to join us?

单选题 The directors would ______ the key issue on Friday morning, as they searched for a legally binding agreement.

单选题Successful leaders ______ events rather than react to them.

单选题I spent the whole day yesterday rearranging my books ______ their subjects and frequency of use. A. as regards B. as against C. as of D. as from

单选题The new power station is reported ______ within three years.

单选题 For a century and a half the piano has been one of the most popular solo instruments for Western music. Unlike string and wind instruments, the piano is completely self-sufficient, as it is able to play both the melody and its accompanying harmony at the same time. For this reason, it became the favorite household instrument of the nineteenth century. The ancestry of the piano can be traced to the early keyboard instruments of the fifteenth and sixteenth centuries—the spinet, the dulcimer, and the virginal. In the seventeenth century the organ, the clavichord, and the harpsichord became the chief instruments of the keyboard group, a supremacy they maintained until the piano supplanted them at the end of the eighteenth century. The clavichord's tone was metallic and never powerful; nevertheless, because of the variety of tone possible to it, many composers found the clavichord a sympathetic instrument for intimate chamber music. The harpsichord with its bright, vigorous tone was the favorite instrument for supporting the bass of the small orchestra of the period and for concert use, but the character of the tone could not be varied save by mechanical or structural devices. The piano was perfected in the early eighteenth century by a harpsichord maker in Italy (though musicologists point out several previous instances of the instrument). This instrument was called a piano eforte (soft and loud), to indicate its dynamic versatility; its strings were struck by a recoiling hammer with a felt-padded head. The wires were much heavier in the earlier instruments. A series of mechanical improvements continuing well into the nineteenth century, including the introduction of pedals to sustain tone or to soften it, the perfection of a metal frame, and steel wire of the finest quality, finally produced an instrument capable of myriad tonal effects from the most delicate harmonies to an almost orchestral fullness of sound, from a liquid, singing tone to a sharp, percussive brilliance.

单选题 His dominant ______ was to take all things into earnest consideration.

单选题Cathy (had) better (to change) her study habits if she (hopes to) be admitted (to a good university).

单选题Though he was almost ninety years old, he was still alive and ______.

单选题Substances, whether in the solid, liquid, or gaseous state, possess______ which are independent of the force of cohesion.

单选题A: Operator, I'd like you to put me through to room 302.B: ______

单选题The new system is similar to the old one ______ there is still a strong central government.

单选题 Michelle found it difficult to get his British jokes ______ to Australian audiences.

单选题As you have seen. the value of a nation's currency is a ______ of its economy.