Because osteoporosis （骨質(zhì)疏松） often causes no symptoms at all until a fall breaks a bone, the only way to tell if you have it is through a bone mineral thickness test．This is advised for anyone over 50 who has suffered a broken bone and all women over 65．Right now, the test involves lying on your back while the arm of a special X-ray device moves over your body to measure the thickness of various bones．

CyberLogic, a New York R&D firm, has developed a simpler device that’s nine inches high, runs on four AA batteries and scans bones with ultrasound． If the portable machine proves as reliable as X-rays, it could be a breakthrough, says New York osteoporosis expert Dr． Ethel Siris．“A small device like this could make bone checkups part of a routine office visit, because it’s both affordable and user-friendly．” If testing shows that you have osteoporosis, some major advances in treatment can help．While there are several effective medications on the market, including Fosamax, Actonel, Evista, Miacalcin and Forteo, the latest wonder drug is Boniva, the first once-a-month pill for osteoporosis．The FDA recently approved this drug, which works by reducing activity in cells responsible for bone breakdown．

Should osteoporosis get severe enough to break a vertebra, doctors have a new way to make repairs: Two tiny balloons are inserted into the bone through surgical tubes．The balloons are expanded to push the bone back into its normal position, then bone cement is used to keep it from breaking again．

1．What does the underlined word “This” in paragraph 1 refer to?

A．Osteoporosis often causes no sign．

B．The only way to tell if you have osteoporosis．

C．A bone mineral thickness test．

D．A fall snaps a bone．

2．What can we infer from the passage?

A．Women are easier to get osteoporosis．

B．Men are easier to get osteoporosis．

C．Anyone over 50 is easy to get osteoporosis．

D．Man and women share equal chances to get osteoporosis．

3．Which of the following is true about the portable scanner?

A．It’s easy to carry along．                      B．It’s as reliable as X-rays．

C．It’s a breakthrough．                                   D．It’s not yet put into experiment．

4．Which of the four medications is the most convenient?

A．Fosamax．          B．Evista．           C．Forteo．       D．Boniva．

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