题目内容
阅读下面短文,用括号内所给动词的适当形式填空。(必要时可加助动词或情态动词)
Many scientists say that the world (1) (get) hotter and hotter.If they are right, the ice at the North and South Poles (2) (melt 融化) eventually, if this (3) (happen), the sea will rise and may cover most or all of Singapore This (4) (force) everybody to move to a safer country.
We know that the sun (5) (heat) the earth.The heat from the sun hits the ground, and some of it goes back into the sky However, factories and vehicles(车辆) produce a lot of harmful gases.When the gases rise into the sky, heat from the sun (6) (come) through them but heat from the ground cannot, it stays near us in the sky and makes the air hotter anti hotter every year.
Scientists call this the “greenhouse effect” because a greenhouse is a small glass building which is hot inside.It (7) (use) for growing plants in cool countries.Many countries are worried about the greenhouse effect.They (8) (try) to stop factories and vehicles from (9) (send) harmful gases into the shy.Scientists are not sure when the world much hotter.Some people say that the greenhouse effect(10) (start) already anti has begun to affect the world’s weather.
1.is getting 2.will melt 3.happens 4.will force 5.heats
6.can come 7.is used 8.are trying 9.Sending 10.has started