题目内容：
Jessica Bucknam shouts “tiao!” (tee-ow) and her fourth-grade students jump.“Dun!” (doo-wen) she commands, and they crouch (蹲). They giggle (吃吃地笑) as the commands keep coming in Mandarin Chinese.
Half of the 340 students at the K-5 school are enrolled in the program. They can continue studying Chinese in middle and high schools. The goal: to speak like natives.
About 24,000 American students are currently learning Chinese. Most are in high schoos. But the number of younger students is growing in response to China’s emergence as a global superpower.
“China has become a strong partner of the United States,” says Mary Patterson, Woodstock’s principa. “Children who learn Chinese at a young age will have more oppoutunities for jobs in the future.”
Isabel Weiss, 9, isn’t thinking about the future. She thinks learning Chinese is fun. “when you her people speaking in Chinese, you know what they’re saying,” she says. “And they don’t know that you know.”What do the fourth-grade students seem to be doing in the first paragraph?（ ） A．They are learning how to jum
B．They are learning how to crouc
C．They are learning how to giggl
D．They are learning Chines
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