【C4】A．sunB．earthC．rocksD．meteorites

The theory that the impact of a giant meteorite caused the extinction of the dinosaurs is

下列公式中，哪一个是合法的舍位平衡公式？A、C4=C1＋C2－C3B、C4=C1*C2－C3C、C4=C4@1＋C3D、C4=C3＋C2

【C9】A．worldB．earthC．geographyD．globe

In the future, people will mainly depend on ______ energy.A．sunB．solarC．mineD．mineral

They stand ______.A．under the sunB．in the sunC．over the sunD．against the sun

Gow wants to solve the Peruvian trouble by______.A．trapping heat from the sunB．making the