单选题 (21) summary of the physical and chemical (22) of life must begin, not on the Earth, but (23) the Sun; in fact, (24) the Sun's very center. (25) is here that is to be found the (26) of the energy that the Sun constantly (27) space (28) light and heat. This energy is liberated at the center of the Sun as billions upon billions of nuclei hydrogen atoms (29) each other and (30) to form nuclei of helium, and, (31) doing so, (32) some of the energy that is stored in the nuclei of atoms. The output of light and heat of the Sun (33) that some 600 million tons of hydrogen (34) helium in the Sun every second. This the Sun (35) for several thousands of millions of years.
单选题
A. A B. The C. That D. This
【正确答案】
A
【答案解析】
单选题
A. integrity B. creation C. pollution D. nature
【正确答案】
D
【答案解析】
单选题
A. on B. in C. with D. by
【正确答案】
B
【答案解析】
单选题
A. in B. on C. at D. to
【正确答案】
C
【答案解析】
单选题
A. What B. Which C. It D. They
【正确答案】
C
【答案解析】
单选题
A. source B. sources C. resource D. resources
【正确答案】
A
【答案解析】
单选题
A. pours out with B. pours at C. pours with D. pours out into
【正确答案】
A
【答案解析】
单选题
A. for B. by C. on D. as
【正确答案】
B
【答案解析】
单选题
A. collides with B. to collide with C. collide with D. colliding
【正确答案】
C
【答案解析】
单选题
A. confuse B. fuse together C. fuse D. confuse with
【正确答案】
B
【答案解析】
单选题
A. in B. by C. at D. on
【正确答案】
B
【答案解析】
单选题
A. relieve B. relieving C. release D. releasing
【正确答案】
C
【答案解析】
单选题
A. acquires B. requires C. inquires D. demands
【正确答案】
B
【答案解析】
单选题
A. be switched to B. be diverted into C. be reverted to D. be converted to
【正确答案】
D
【答案解析】
单选题
A. has been B. has been doing C. has been done D. has done