[单项选择]The fuel of the continental missile is supposed to be ________ by this device,


A. ignited
B. lighted
C. fired
D. inspired

[单项选择]The fuel of the continental missile is supposed to be （） by this de vice.
A. lighted
B. inspired
C. fired
D. ignited

[单项选择]The 1961 missile crisis brought, the world to the ______ of all-out war.
A. miser
B. verge
C. prospect
D. concern

[单项选择]At the time of Cuban Missile Crisis, the President of the U .S. was______.


A. Truman
B. Eisenhower
C. Kennedy
D. Johnson

[单项选择]During examinations candidates are always supposed to stay in seats， keep their eyes on the work， ____ to anyone.
A. and not speak
B. but could not speak
C. rather than speak
D. instead of speaking

[单项选择]The woman is supposed to be a


A. dentist.
B. job applicant.
C. receptionist.
D. patient.

[单项选择]

Text 1
The origin of continental nuclei has long been a puzzle. Theories advanced so far have ’generally failed to explain the first step in continent growth, or have been subject to serious objections. It is the purpose of this article to examine the possible role of the impact of large meteorites or asteroids in the production of continental nuclei. Unfortunately, the geological evolution of the Earth’ s surface has had an obliterating effect on the original composition and structure of the continents to such an extent that further terrestrial investigations have small chance of arriving at an unambiguous answer to the question of continental origin. Paradoxically, clues to the origin and early history of the surface features of the Earth may be found on the Moon and planets, rather than on the Earth, because some of these bodies appear to have had a much less active geological history. As a result, relatively primitive surface features are preserved
A. has fallen into wide dispute ever since it was proposed
B. fails to explain how continents were originated and have changed
C. was discarded as unacceptable immediately after it was proposed
D. rightly explains the formation of most of the ocean basins

[单项选择]When are airplanes not fuel efficient


A. On short trips.
B. On long trips.
C. When flying over cities.
D. When flying at high altitudes.

[单项选择]After several ______ attempts to send the missile into space, the spacecraft was finally launched successfully.
A. abortive
B. difficult
C. experimental
D. excellent