Câu 4: Solar energy is not plentiful and... but also clean and safe.
A. limited B. exhausted C. infinite D. dangerous
A. Reading the passage and choose A, B, C, or D to fill each blank.
The number of animals species that have died out since 1600 has………..(5) sharply.
Experts have looked for historical evidence of……….(6). As……….(7) as they can tell,
between the beginning of modern historical records and the beginning of the 17 th century,
fewer………(8) twenty species of animals died out. ……….(9) , in just one century, from
1600 to 1699 seventeen more animals species are known to have disappeared.
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