单选题HowmanyOlympicemployeesandvolunteerswereatthe23rdOlympicGames?A.14,300.B.Approximately103,000C.Morethan43,000.

单选题I'd rather ______ it again.[A] you did[B] your doing[C] you to do[D] you doing

单选题Where does this interview take place?

单选题The underlined word "they" ( paragraph 5 ) refers to ______.

单选题The Second World War broke out in ______.A. 1930sB. the 1930esC. the 1930sD. 1930's

单选题

单选题______ is a good form of exercise for both young and old.[A] Walking[B] To walk[C] The walk[D] Walk

单选题听第6段对话，回答第6～7题。

单选题The play is starting______five minutes but the theatre is only half full.

单选题It can be inferred from the passage that only children's parents should______.

单选题From the first paragraph we can see that ______.

单选题They only met twice ______ the whole time they were neighbors. A. around B. during C. in D. by

单选题Howmuchistheskirt?

单选题She would rather stay at home than ______ with John.

单选题This article tells that the Speech Machine's system comes from ______ technology.

单选题{{B}}C{{/B}} We experience different forms of the sun's energy every day. The sun is the major source of energy for our planet. It causes the evaporation(蒸发)of water from the oceans and lakes. Sunlight also provides the energy used by green plants to make their own food. Much of the energy that comes from the sun never reaches the earth's surface. It is either reflected or absorbed by the gases in the upper atmosphere. Of the energy that reaches the lower atmosphere, 30% is reflected by clouds or the earth's surface. The remaining 70% warms the surface of the planet, causes water to evaporate, and provides energy for the water cycle and weather. Only a tiny part, approximately 0.023%, is actually used by green plants to produce food. Many gases found in the atmosphere actually reflect heat energy escaping from the earth's surface back to the earth. These gases act like the glass of a greenhouse in that they allow energy from the sun to enter but prevent energy form leaving. They are therefore called greenhouse gases. When sunlight strikes an object, some of the energy is absorbed and some is reflected. The amount reflected depends on the surface. Dark-colored surfaces, such as dark soil or forest, absorb more energy.

单选题How foolish it is______her to believe ______such a man's honesty! A. of... in B. for.., in C. for.., on D. of... on

单选题The underlined part "in contrast" in this passage means______.