There are several other__12__to predict earthquakes. Scientists can measure the tiny__13__in the tilt(倾斜)of the land that happen before an earthquake occurs. Increases in the amount of radon(氡), a substance found in deep__14__， as well as a high level of water in the wells, can also__15__that an earthquake is likely to occur. In addition, scientists have found that some animals, like dogs, behave__16__before an earthquake: they become__17__and howl.

　　Seismologists have__18__predicted several earthquakes, such as the earthquake which occurred in Zhangjiakou, China in 1998. __19__， not all earthquakes are predictable, and a system for predicting is not yet__20__.

　　1．A.possible

　　B．likely

　　C．probable

　　D．hopeful

　　答案：B　sb./sth. is likely to do sth.意为“某人/某物有可能做某事”。probable, possible常用it作主语。

　　2．A.over

　　B．up

　　C．on

　　D．against

　　答案：D　push against sth.意为“对某物施加压力，挤压某物”。

　　3．A.study

　　B．learn

　　C．search

　　D．watch

　　答案：A　本句意“使用不同的仪器，他们密切地研究这些地区”。

　　4．A.take

　　B．observe

　　C．measure

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