单斜谷是沿单斜岩层走向伸展的河谷。单斜岩层反倾的一侧谷坡较陡,不利于公路布线。()
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风化作用可分为物理风化作用、化学风化作用和生物风化作用三大类。()
A. 对
B. 错
“We will do what we can to get the goods __________ on time,” said the manager of the company.
A. reached
B. arrived
C. delivered
D. come
He won’t go on doing the job __________ he gets his salary raised.
A. when
B. after
C. If
D. unless
The news has already __________ all over the country.
A. spent
B. spread
C. shocked
D. increased