Some two thousand million years ago, the mountain on the sun was raised probably because______.

A． the star moved away from the sun

B． another star happened to come near the sun

C． fhe sun and the moon raised the tides on the earth

D． a large tidal wave of a star travelled over the surface of the sun

Two thousand years ago, there were only 250 million people 3 the earth. Four

[单选题]A high water mark of ￡150 million was established two years ago for a Briti

[单选题]His father gave up smoking two years ago . 学科网A. enjoyed B. failed C. stopped 学科H．is father gave up smoking two years ago .A． enjoyed B. failed C. stopped

Million of(A) years ago, there lived(B) a lot of huge (C) animals on the earth.M

Two hundred years ago, news between the continents was carried______.A. by airB.

[单选题]The house has been( )ever since the Johnsons moved out two years ago.A.conc

[单选题]根据下列材料请回答 16～30 题：Some years ago，Chinese high school students would show their new schoolbags，new clothes or new pens to their classmates when the new term started．Today，however，all have 16 If you still come back to school 17 0nly these things，you ar

[问答题]Two months ago, you and some former classmates decided to go for an outing

The human brain contains 10 thousand million cells，and each of these may have a

The human brain contains 10 thousand million cells and each of these may have a