B. Peter tried to print a clock, but in vain.

　　C. a remarkable metal bracket is being created.

　　D. 3D printing technology is available to all of us.

　　2. The underlined word “embark” probably means “_________”.

　　A. workB. landC. dependD. fix

　　3. We can conclude from the last paragraph that __________.

　　A. Terry Wohlers’ s firm will make great profits

　　B. the technology of 3D printers will be widely adopted

　　C. 3D printers have been in use for at least 100 years

　　D. engineers and designers prefer printing original products

　　4. The passage is developed mainly in the form of _______.

　　A. time and events

　　B. definition and description

　　C. contrast and conclusion

　　D. examples and statements

　　【参考答案】1—4、 CABD

　　阅读下列四篇短文，从每小题后所给的A,B,C或D四个选项中，选出最佳选项。

　　Rainforest is home to around two-thirds of all plant and animal species found on land—in addition to millions of people who depend on them for survival—our remaining ancient forests are some of the most diverse ecosystems known to science. They are also vitally important to the health of our planet, especially when it comes to regulating the climate. But ancient forests around the world are under attack.

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